October 2015 – December 2015

Key points Overall S. aureus (SA) rates for Northern Ireland (MRSA plus MSSA bacteraemias) decreased by

approximately 25% during October-December 2015 compared to July-September 2015.

MRSA rates decreased by approximately 51% during October-December 2015 compared to July-

September 2015.

MRSA reports during 2014/15 rose by 8% compared to 2013/14.

MSSA rates decreased by approximately 18% compared to July-September 2015.

MSSA reports during 2014/15 decreased by 5% compared to 2013/14.

MSSA rates remain within expected parameters on the SPC chart for Northern Ireland.

For further information or clarification on HCAI definitions, please refer to previous reports or contact hcaini@hscni.net

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S. aureus bacteraemia surveillance

Figure 1: MSSA, MRSA and S. aureus rates in Northern Ireland by quarter, with 95%

confidence intervals, April 2001 – December 2015 (see Appendix 3)

Figure 2: MRSA and MSSA rates per 1,000 occupied bed days, by HSCT, October –

December 2015

2

Figure 3: MRSA quarterly rate January 2014 – December 2015, by HSCT, with 2015 annual

HSCT MRSA rate

Figure 4: MRSA rate during October - December, by HSCT, from 2012–2015, with 95% confidence

intervals

3

Figure 5: MSSA quarterly rate January 2014 – December 2015, by HSCT, with 2015 HSCT

MSSA rate

Figure 6: MSSA rate during October - December, by HSCT, from 2012–2015, with 95% confidence

intervals

Figure 7: Rates of MRSA, October - December 2015 by individual hospitals, (gaps represent zero episodes), compared to October - December 2015

average rates for Northern Ireland and HSCTs

5

Figure 8: Rates of MSSA, October - December 2015 by individual hospitals, (gaps represent zero episodes), compared to average rates for Northern

Ireland and HSCTs, October - December 2015

6

Figure 9a: Statistical process control chart for quarterly S. aureus rates in Northern Ireland

Figure 9b: Statistical process control chart for quarterly MRSA rates in Northern Ireland

Figure 9c: Statistical process control chart for quarterly MSSA rates in Northern Ireland

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Appendix 1

Table 1: Quarterly rate of MRSA patients, by hospital, Jan 2015 – Dec 2015

Table 2: Quarterly episodes of MRSA patients, by Trust, Jan 2015 – Dec 2015

8

Appendix 1

Table 3: Quarterly rate of MSSA patients, by hospital, Jan 2015 - Dec 2015

Table 4: Quarterly episodes of MSSA patient, by Trust, Jan 2015 - Dec 2015

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Appendix 2: Trends in MRSA rates, by HSCT and quarter, 2001–2015

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Appendix 2: Trends in MSSA rates, by HSCT and quarter, 2001–2015

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Appendix 3

Table 5: MSSA, MRSA and total S. aureus patient episode rates, and the percentage of S. aureus

reported as MRSA, in Northern Ireland, Jan 2006 – Dec 2015

Quarter MSSA rate MRSA rate All S. aureus rate % MRSA

Jan-Mar 2006 0.186 0.135 0.321 42.1

Apr-Jun 2006 0.199 0.157 0.356 44.1

Jul-Sep 2006 0.201 0.129 0.33 39.1

Oct-Dec 2006 0.159 0.115 0.273 42.1

Jan-Mar 2007 0.208 0.145 0.353 41.1

Apr-Jun 2007 0.183 0.091 0.274 33.2

Jul-Sep 2007 0.181 0.146 0.326 44.8

Oct-Dec 2007 0.187 0.137 0.324 42.3

Jan-Mar 2008 0.194 0.129 0.323 39.9

Apr-Jun 2008 0.184 0.136 0.32 42.5

Jul-Sep 2008 0.252 0.122 0.375 32.5

Oct-Dec 2008 0.223 0.087 0.31 28.1

Jan-Mar 2009 0.182 0.120 0.302 39.7

Apr-Jun 2009 0.207 0.092 0.299 30.8

Jul-Sep 2009 0.206 0.069 0.275 25.1

Oct-Dec 2009 0.195 0.107 0.302 35.4

Jan-Mar 2010 0.202 0.064 0.266 24.1

Apr-Jun 2010 0.175 0.091 0.267 34.1

Jul-Sep 2010 0.164 0.074 0.239 31.0

Oct-Dec 2010 0.162 0.062 0.224 27.7

Jan-Mar 2011 0.152 0.061 0.214 28.5

Apr-Jun 2011 0.181 0.054 0.235 23.0

Jul-Sep 2011 0.193 0.082 0.275 29.8

Oct-Dec 2011 0.206 0.044 0.250 17.6

Jan-Mar 2012 0.179 0.067 0.246 27.2

Apr-Jun 2012 0.216 0.034 0.250 13.6

Jul-Sep 2012 0.186 0.048 0.234 20.5

Oct-Dec 2012 0.173 0.044 0.216 20.4

Jan-Mar 2013 0.162 0.056 0.218 25.7

Apr-Jun 2013 0.169 0.036 0.205 17.6

Jul-Sep 2013 0.230 0.049 0.278 17.6

Oct-Dec 2013 0.188 0.053 0.241 22.0

Jan-Mar 2014 0.195 0.026 0.221 11.8

Apr-Jun 2014 0.200 0.034 0.234 14.5

Jul-Sep 2014 0.177 0.053 0.229 23.1

Oct-Dec 2014 0.168 0.036 0.204 17.6

Jan-Mar 2015 0.184 0.050 0.234 21.4

Apr-Jun 2015 0.193 0.052 0.245 21.2

Jul-Sep 2015 0.234 0.070 0.304 23.0

Oct-Dec 2015 0.193 0.034 0.227 15.0

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Appendix 4

Table 6: MRSA patient episodes for each financial year, by HSCT

Financial Year

HSCT 2005/06 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 2014/15

Belfast 118 115 109 86 62 48 46 32 18 28

Northern 46 47 42 35 22 27 19 14 12 11

South Eastern 32 49 34 46 28 15 14 13 15 7

Southern 27 19 14 16 15 11 10 1 5 9

Western 27 18 22 20 11 15 7 10 12 12

Northern Ireland 250 248 221 203 138 116 96 70 62 67

Table 7: MSSA patient episodes for each financial year, by HSCT

Financial Year

HSCT 2005/06 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 2014/15

Belfast 141 130 161 157 138 103 109 115 121 112

Northern 66 60 46 57 66 46 57 42 43 37

South Eastern 39 51 46 56 43 46 57 54 57 50

Southern 27 56 38 59 40 28 38 32 38 42

Western 52 51 37 37 49 39 34 40 38 40

Northern Ireland 325 348 328 366 336 262 295 283 297 281